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Cathode material precursor, preparation method thereof, cathode material and lithium battery

A positive electrode material and precursor technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor safety performance of lithium-ion batteries, and achieve the effect of improving safety performance, improving specific capacity and cycle performance

Active Publication Date: 2012-05-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor safety performance of lithium-ion batteries in the prior art, the present invention provides a precursor of positive electrode material, and the safety performance of lithium-ion batteries prepared by the precursor of positive electrode material has been greatly improved

Method used

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  • Cathode material precursor, preparation method thereof, cathode material and lithium battery
  • Cathode material precursor, preparation method thereof, cathode material and lithium battery
  • Cathode material precursor, preparation method thereof, cathode material and lithium battery

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preparation example Construction

[0020] At the same time, the preparation method of the cathode material precursor disclosed in the present invention includes:

[0021] a. Under stirring conditions, add the nuclear metal source solution and the precipitating agent solution dropwise into the base solution, and react at a pH of 11-12; the nuclear metal is selected from one or more of nickel, manganese or cobalt ;

[0022] b. Add the titanium alkoxide solution dropwise to the above system, continue to stir and react;

[0023] c. Add shell metal source solution and react at pH 10-11; the shell metal is manganese.

[0024] Wherein, as known to those skilled in the art, the nuclear metal source solution is an aqueous solution of the nuclear metal source, wherein the nuclear metal source is one or more of sulfate, nitrate, and acetate of the nuclear metal The nuclear metal is selected from one or more of nickel, manganese or cobalt, that is, the nuclear metal source is nickel sulfate, nickel nitrate, nickel acetat...

Embodiment 1

[0061] This example is used to illustrate the cathode material precursor and its preparation method, the cathode material and its preparation method disclosed in the present invention.

[0062] First pass nitrogen to replace all the air in the 100L reactor, the flow rate is 0.5m 3 / h, the rotation speed of the stirring paddle is 160rad / min, after 30min, adjust the flow rate to 0.1m3 / h. 36L nuclear metal source solution (NiSO 4 、CoSO 4 aqueous solution, in which Ni 2+ The concentration is 1.6mol / L, Co 2+ concentration of 0.4mol / L) and 8L precipitant solution (mixed solution of sodium hydroxide and ammonia water, wherein the concentration of sodium hydroxide is 8mol / L, the concentration of ammonia is 2.58mol / L) slowly drop into the bottom of 20L solution (ammonia solution, the concentration of ammonia is 0.75wt%), the reaction temperature is controlled at 40°C, the dropping rate of the nuclear metal source solution is 25ml / min, the dropping rate of the precipitant solution ...

Embodiment 2

[0070] This example is used to illustrate the cathode material precursor and its preparation method, the cathode material and its preparation method disclosed in the present invention.

[0071] First pass nitrogen to replace all the air in the 100L reactor, the flow rate is 0.5m 3 / h, the rotation speed of the stirring paddle is 160rad / min, after 30min, adjust the flow rate to 0.1m 3 / h. 36L nuclear metal source solution (aqueous solution of nickel nitrate and cobalt nitrate, in which Ni 2+ The concentration is 1.6mol / L, Co 2+ concentration of 0.4mol / L) and 7L precipitant solution (mixed solution of sodium hydroxide and ammonia water, wherein the concentration of sodium hydroxide is 8mol / L, the concentration of ammonia is 2.1mol / L) slowly drop into the bottom of 20L In the solution (ammonia solution, the concentration of ammonia is 0.75 wt %), the reaction temperature is controlled at 40°C, the dropping rate of the nuclear metal source solution is 30ml / min, the dropping rat...

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Abstract

The invention provides a cathode material precursor, a preparation method thereof, a cathode material and a lithium battery. The cathode material precursor has a nuclear shell structure, wherein an inner core is a hydroxide of a nuclear metal, a shell is a hydroxide of a shell metal, the nuclear metal is selected from one or more of nickel, manganum and cobalt, and the shell metal is manganum; and in addition, a secondary outer layer serving as a titanium dioxide layer is arranged between the inner core and the shell. The safety of the lithium battery prepared by using the cathode material precursor is greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a positive electrode material precursor, a preparation method thereof, a positive electrode material and a lithium battery. Background technique [0002] The positive electrode materials of lithium-ion batteries are generally lithium cobalt oxygen, lithium nickel oxygen, lithium manganese oxygen, lithium nickel manganese cobalt oxygen and the like. There are many methods for synthesizing positive electrode materials, but most of them use precipitation method to generate positive electrode material precursors, and then sinter the positive electrode material precursors and lithium source in an oxygen atmosphere to form positive electrode materials. [0003] Among them, the general steps of the precipitation method are: metal sources such as nickel source, manganese source, and cobalt source are mixed with the precipitant solution in the bottom liquid, and react to f...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/131H01M4/1391H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李阳
Owner BYD CO LTD
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